Server Overloaded

When looking at the web site for user stats, users often see a message about the server being overloaded. The BWM and server all seem ok wrt memory, cpu etc. Rebooting the server fixes it.
Am I doing anything wrong?

It seems some users have long lasting connections or something like that. How many users do you have altogether? The built-in web-server is supposed to serve at most 10 clients at a time, but I can increase this number.

Could you please provide some more information? When it happens again, please open a command prompt and launch netstat -n. This will print all the connections established to the server. Then simply save it to a file using this command: netstat -n > myfile.txt and post the the file here.